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US 5,317,471 AGranted
Process and device for setting a thermal trip device with bimetal strip
AssigneeGerin Merlin
InventorsJean Izoard, M. Eric Menegaz, Jean-Louis Drillat, Philippe Le Maitre
Life of this patent
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Abstract
A thermal setting process of the bimetal strip consists in securing an adjusting pin to the trip bar by means of laser welding when the bimetal strip reaches a first preset temperature, and then checking tripping at a second temperature with or without action on a positioning screw of the bar.
Claims16
A process for setting a thermal trip device, comprising the steps of;
- inserting an adjusting pin into an orifice of a trip bar such that said adjusting pin is slidable therein;
- heating a bimetal strip via application of a setting current such that said bimetal strip is deflected, said bimetal strip being positioned opposite said adjusting pin so as to contact and drive said adjusting pin in said orifice;
- measuring the temperature of the bimetal strip during application of said setting current;
- and
- immobilizing said adjusting pin in said orifice at an optimum position when the temperature of said bimetal strip reaches a first preset value.
2 more elements
An adjustable thermal trip device for an electronic circuit breaker, comprising;
- a bimetal strip;
- a rotary trip bar positioned with respect to the bimetal strip such that deflection of said bimetal strip due to an overload current drives said rotary trip bar to a tripped position, said rotary trip bar comprising a latching arm for latching with a lock, and a positioning arm;
- an adjusting pin disposed within an orifice in said positioning arm, said bimetal strip coming into contact with said adjusting pin during an overload current flow, wherein said adjusting pin is immobilized within said orifice at an optimum position by a weld.
Dependencies are inferred from the claim text.